Before being accused with her boyfriend of stuffing her mom's dead body in a suitcase while on a Bali vacation, Heather Mack reportedly fought constantly with her mother back home in suburban Chicago.

Police told the Chicago Sun-Times that the fights between Heather Mack, 19, and Shelia von Wiese-Mack, 62, were intense and that authorities in Oak Park were called to their home 86 times since 2004 because of "constant screaming matches" between the two.

Over that time, von Wiese-Mack accused her daughter of biting and punching her. Heather Mack was arrested in January 2011 for allegedly breaking her mother's arm, authorities told the newspaper.

The New York Daily News reported that Bali investigators believe the two argued over a hotel bill before von Wiese-Mack was murdered. The newspaper said authorities there believe Mack and her boyfriend, Tommy Schaefer, 21, bludgeoned von Wiese-Mack and tried to conceal her body in a suitcase.

Mack and her boyfriend were seen on CCTV leaving the hotel via a stretch of beach at the back of the property, instead of the main entrance. Police launched a hunt and the pair were found sleeping at a hotel in the tourist area of Legian, north of Nusa Dua, early the next day.

Ida Bagus Putu Alit, head of forensics at Sanglah Hospital in Bali's provincial capital of Denpasar, said von Wiese-Mack died of asphyxiation from a broken nose bone resulting from a blunt blow, according to Chicago's WMAQ-TV.

Alit said the autopsy revealed that von Wiese-Mack tried to defend herself, as evidenced by hand wounds, and that neck and nose injuries extended to her upper right and left jaws, causing respiratory disorders.

"We also found blood aspiration, which meant the victim was standing when assaulted," WMAQ-TV reported Alit as saying. "The conclusion is that the victim suffocated from lack of oxygen because of influx of blood from the broken nose bone."

Heather Mack's attorney, Michael Elkin, told WMAQ-TV on Tuesday that Mack is two months pregnant and she has accused Indonesian authorities of sexually assaulting her while in their custody.

"Heather seemed to be dazed and confounded," Elkin said in a statement to the television station. "I asked why she sounded incoherent at times. She said that she was not getting enough water. She also mentioned that she was being given 'vitamin pills,' but could not identify what they were for and asked me if she should stop taking them."Urgent: Assess Your Heart Attack Risk in Minutes. Click Here.